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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Bluish discoloration under the eyes is usually caused by lack of sleep, violet-reddish circles are caused by thinning skin around the eyes, usually caused by skin aging. Brownish-black circles are associated with sun damage, which the shadowy discoloration is caused by aging skin.